using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using BITKit;
using BITKit.Entities;
using System;
using System.Linq;
using UnityEngine.AddressableAssets;

namespace BITFALL
{
    public interface IEntityInventoryCallback
    {
        void OnAdd(IBasicItem item);
        void OnRemove(IBasicItem item);
    }
    public abstract class EntityInventory : EntityComponent, IBasicItemContainer
    {
        /// <summary>
        /// 数据字典
        /// </summary>
        Dictionary<int, IBasicItem> dictionary = new();
        /// <summary>
        /// 隐式接口实现
        /// </summary>
        public int Id => entity.Id;
        /// <summary>
        /// 工厂方法
        /// </summary>
        public event Func<IBasicItem, bool> AddFactory;
        public event Func<IBasicItem, bool> RemoveFactory;
        public event Func<IBasicItem, bool> DropFactory;
        /// <summary>
        /// 回调
        /// </summary>
        public event Action<IBasicItem> OnAdd;
        public event Action<IBasicItem> OnRemove;
        public event Action<IBasicItem> OnSet;
        public event Action<IBasicItem> OnDrop;
        public event Action<IBasicItemContainer> OnRebuild;
     
        public virtual bool Add(IBasicItem item)
        {
            var pars = new object[] { item };
            if (AddFactory != null)
                foreach (var x in AddFactory.GetInvocationList())
                {
                    if (x.Method.Invoke(x.Target, pars) is false)
                    {
                        return false;
                    }
                }
            if (dictionary.TryAdd(item.Id, item))
            {
                OnAdd?.Invoke(item);
                foreach (var x in entity.GetCallbacks<IEntityInventoryCallback>())
                {
                    x.OnAdd(item);
                }
                return true;
            }
            else
            {
                return false;
            }
        }
        public virtual IBasicItem[] GetItems() => dictionary.Values.ToArray();
        public virtual bool Remove(IBasicItem item)
        {
            return Remove(item.Id);
        }
        public virtual bool Remove(int id)
        {

            if (dictionary.TryGetValue(id, out var item))
            {
                var pars = new object[] { item };
                if(RemoveFactory is not null)
                foreach (var x in RemoveFactory.GetInvocationList())
                {
                    if (x.Method.Invoke(x.Target, pars) is false)
                    {
                        return false;
                    }
                }
                dictionary.Remove(id);
                foreach (var x in entity.GetCallbacks<IEntityInventoryCallback>())
                {
                    x.OnRemove(item);
                }
                OnRemove?.Invoke(item);
                return true;
            }
            else
            {
                return false;
            }
        }

        public virtual bool Remove(Func<IBasicItem, bool> removeFactory)
        {
            bool isRemoved = false;
            foreach (var x in dictionary.Values.ToArray())
            {
                if (removeFactory.Invoke(x))
                {
                    Remove(x.Id);
                    isRemoved = true;
                }
            }
            return isRemoved;
        }
        public bool TryGetItem(Func<IBasicItem, bool> func, out IBasicItem item)
        {
            return dictionary.Values.TryGetAny(func, out item);
        }
        public bool Drop(int Id)
        {
            if (dictionary.TryGetValue(Id, out var item))
            {
                if (Remove(item))
                {
                    var pars = new object[] { item };
                    if (DropFactory is not null)
                        foreach (var x in DropFactory.GetInvocationList())
                        {
                            if (x.Method.Invoke(x.Target, pars) is false)
                            {
                                return false;
                            }
                        }
                    var prefab = Addressables.LoadAssetAsync<AssetableItem>(item.AdressablePath).WaitForCompletion();
                    var instance = Instantiate(prefab.GetPrefab(), transform.position, transform.rotation);
                    instance.CopyItemsFrom(item);
                    return true;
                }
            }
            return false;
        }
    }
}